Construction method of water seepage and plugging in shaft construction joints under high water head

Abstract

The invention discloses a water seepage plugging construction method of shaft construction seams under high water head. The water seepage plugging construction method includes that I-sequence grouting holes, II-sequence grouting holes and III-sequence grouting holes are arranged within a certain ranges of the seams, and water-soluble polyurethane chemical materials are injected into concrete cracks by the aid of a high-pressure grouting pump; when running into water in the concrete cracks, grout is rapidly dispersed, emulsified, expanded and solidified, so that all the cracks can be filled with solidified elastomers and water flow can be completely blocked out of a concrete structure; chemical grouting materials are filled into gaps between steel plates and wall surfaces on water seepage sides of the cracks, so that seamless integration of the steel plates and the wall surfaces can be guaranteed. Plugging construction on the water seepage side is free of affection of outside water level, normal operation of water conservancy rules is unaffected, and engineering benefits are improved; the water seepage plugging construction method has the advantages of safe construction, fast speed, reliable quality, low cost and the like.

Description

technical field [0001] The invention relates to the field of shaft construction of a hydropower station, in particular to a construction method for water seepage and plugging of construction joints of a shaft under high water head. Background technique [0002] In the construction of water conservancy projects, vent holes or gate wells are shaft structures that are often encountered. Due to the characteristics of the project itself, the height of the shaft structure is generally about tens of meters, or even higher. During construction, it is poured in sections from the bottom to the top under anhydrous conditions. Each section of contact surface is called a construction joint. The joint surface will be the weak layer of the structure, which will be damaged under the action of external force, and water seepage will occur in the construction joint under the action of water pressure. In the construction of water conservancy projects in my country, high water head and strong ...

AI Technical Summary

Problems solved by technology

[0006] In many cases, the external water level cannot and cannot be lowered by the way, and it is impossible to guarantee grouting without water pressure

The gap is small, and the cement mortar cannot completely fill the gap, resulting in incomplete plugging and unable to fundamentally solve the problem of water leakage

The cement slurry or cement mortar takes a long time to solidify, and it is easy to shrink and produce gaps after solidification, resulting in many times of refilling, long construction period and high construction cost

During the plugging construction, it will affect the normal operation of the water conservancy project

Images